package invoices

import (
	"time"

	"rmser/internal/domain/invoices"

	"github.com/google/uuid"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

type pgRepository struct {
	db *gorm.DB
}

func NewRepository(db *gorm.DB) invoices.Repository {
	return &pgRepository{db: db}
}

func (r *pgRepository) GetByID(id uuid.UUID) (*invoices.Invoice, error) {
	var inv invoices.Invoice
	err := r.db.
		Preload("Items").
		Preload("Items.Product").
		Where("id = ?", id).
		First(&inv).Error
	if err != nil {
		return nil, err
	}
	return &inv, nil
}

func (r *pgRepository) GetLastInvoiceDate(serverID uuid.UUID) (*time.Time, error) {
	var inv invoices.Invoice
	// Ищем последнюю накладную только для этого сервера
	err := r.db.Where("rms_server_id = ?", serverID).Order("date_incoming DESC").First(&inv).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil
		}
		return nil, err
	}
	return &inv.DateIncoming, nil
}

func (r *pgRepository) GetByPeriod(serverID uuid.UUID, from, to time.Time) ([]invoices.Invoice, error) {
	var list []invoices.Invoice
	err := r.db.
		Preload("Items").
		Preload("Items.Product").
		Where("rms_server_id = ? AND date_incoming BETWEEN ? AND ? AND status != ?", serverID, from, to, "DELETED").
		Order("date_incoming DESC").
		Find(&list).Error
	return list, err
}

func (r *pgRepository) SaveInvoices(list []invoices.Invoice) error {
	return r.db.Transaction(func(tx *gorm.DB) error {
		for _, inv := range list {
			if err := tx.Omit("Items").Clauses(clause.OnConflict{
				Columns:   []clause.Column{{Name: "id"}},
				UpdateAll: true,
			}).Create(&inv).Error; err != nil {
				return err
			}
			// Удаляем старые Items для этой накладной
			if err := tx.Where("invoice_id = ?", inv.ID).Delete(&invoices.InvoiceItem{}).Error; err != nil {
				return err
			}
			if len(inv.Items) > 0 {
				if err := tx.Create(&inv.Items).Error; err != nil {
					return err
				}
			}
		}
		return nil
	})
}

func (r *pgRepository) CountRecent(serverID uuid.UUID, days int) (int64, error) {
	var count int64
	dateFrom := time.Now().AddDate(0, 0, -days)

	err := r.db.Model(&invoices.Invoice{}).
		Where("rms_server_id = ? AND date_incoming >= ?", serverID, dateFrom).
		Count(&count).Error
	return count, err
}

func (r *pgRepository) GetStats(serverID uuid.UUID) (total int64, lastMonth int64, last24h int64, err error) {
	query := `
		SELECT
			COUNT(*) FILTER (WHERE status != 'DELETED') as total,
			COUNT(*) FILTER (WHERE status != 'DELETED' AND created_at >= NOW() - INTERVAL '1 month') as last_month,
			COUNT(*) FILTER (WHERE status != 'DELETED' AND created_at >= NOW() - INTERVAL '24 hours') as last_24h
		FROM invoices
		WHERE rms_server_id = $1
	`

	err = r.db.Raw(query, serverID).Row().Scan(&total, &lastMonth, &last24h)
	return total, lastMonth, last24h, err
}